hw/cxl: mailbox-utils: 0x5601 - FMAPI Get Host Region Config

FM DCD Management command 0x5601 implemented per CXL r3.2 Spec Section 7.6.7.6.2

Reviewed-by: Fan Ni <fan.ni@samsung.com>
Signed-off-by: Anisa Su <anisa.su@samsung.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Message-Id: <20250714174509.1984430-5-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 106 insertions, 0 deletions

diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c
index 3304048..bf1710b 100644
--- a/hw/cxl/cxl-mailbox-utils.c
+++ b/hw/cxl/cxl-mailbox-utils.c
@@ -120,6 +120,7 @@ enum {
         #define MANAGEMENT_COMMAND     0x0
     FMAPI_DCD_MGMT = 0x56,
         #define GET_DCD_INFO    0x0
+        #define GET_HOST_DC_REGION_CONFIG   0x1
 };
 
 /* CCI Message Format CXL r3.1 Figure 7-19 */
@@ -3286,6 +3287,109 @@ static CXLRetCode cmd_fm_get_dcd_info(const struct cxl_cmd *cmd,
     return CXL_MBOX_SUCCESS;
 }
 
+static void build_dsmas_flags(uint8_t *flags, CXLDCRegion *region)
+{
+    *flags = 0;
+
+    if (region->nonvolatile) {
+        *flags |= BIT(CXL_DSMAS_FLAGS_NONVOLATILE);
+    }
+    if (region->sharable) {
+        *flags |= BIT(CXL_DSMAS_FLAGS_SHARABLE);
+    }
+    if (region->hw_managed_coherency) {
+        *flags |= BIT(CXL_DSMAS_FLAGS_HW_MANAGED_COHERENCY);
+    }
+    if (region->ic_specific_dc_management) {
+        *flags |= BIT(CXL_DSMAS_FLAGS_IC_SPECIFIC_DC_MANAGEMENT);
+    }
+    if (region->rdonly) {
+        *flags |= BIT(CXL_DSMAS_FLAGS_RDONLY);
+    }
+}
+
+/*
+ * CXL r3.2 section 7.6.7.6.2:
+ * Get Host DC Region Configuration (Opcode 5601h)
+ */
+static CXLRetCode cmd_fm_get_host_dc_region_config(const struct cxl_cmd *cmd,
+                                                   uint8_t *payload_in,
+                                                   size_t len_in,
+                                                   uint8_t *payload_out,
+                                                   size_t *len_out,
+                                                   CXLCCI *cci)
+{
+    struct {
+        uint16_t host_id;
+        uint8_t region_cnt;
+        uint8_t start_rid;
+    } QEMU_PACKED *in = (void *)payload_in;
+    struct {
+        uint16_t host_id;
+        uint8_t num_regions;
+        uint8_t regions_returned;
+        struct {
+            uint64_t base;
+            uint64_t decode_len;
+            uint64_t region_len;
+            uint64_t block_size;
+            uint8_t flags;
+            uint8_t rsvd1[3];
+            uint8_t sanitize;
+            uint8_t rsvd2[3];
+        } QEMU_PACKED records[];
+    } QEMU_PACKED *out = (void *)payload_out;
+    struct {
+        uint32_t num_extents_supported;
+        uint32_t num_extents_available;
+        uint32_t num_tags_supported;
+        uint32_t num_tags_available;
+    } QEMU_PACKED *extra_out;
+    CXLType3Dev *ct3d = CXL_TYPE3(cci->d);
+    uint16_t record_count, out_pl_len, i;
+
+    if (in->start_rid >= ct3d->dc.num_regions) {
+        return CXL_MBOX_INVALID_INPUT;
+    }
+    record_count = MIN(ct3d->dc.num_regions - in->start_rid, in->region_cnt);
+
+    out_pl_len = sizeof(*out) + record_count * sizeof(out->records[0]);
+    extra_out = (void *)out + out_pl_len;
+    out_pl_len += sizeof(*extra_out);
+
+    assert(out_pl_len <= CXL_MAILBOX_MAX_PAYLOAD_SIZE);
+
+    stw_le_p(&out->host_id, 0);
+    out->num_regions = ct3d->dc.num_regions;
+    out->regions_returned = record_count;
+
+    for (i = 0; i < record_count; i++) {
+        stq_le_p(&out->records[i].base,
+                 ct3d->dc.regions[in->start_rid + i].base);
+        stq_le_p(&out->records[i].decode_len,
+                 ct3d->dc.regions[in->start_rid + i].decode_len /
+                 CXL_CAPACITY_MULTIPLIER);
+        stq_le_p(&out->records[i].region_len,
+                 ct3d->dc.regions[in->start_rid + i].len);
+        stq_le_p(&out->records[i].block_size,
+                 ct3d->dc.regions[in->start_rid + i].block_size);
+        build_dsmas_flags(&out->records[i].flags,
+                          &ct3d->dc.regions[in->start_rid + i]);
+        /* Sanitize is bit 0 of flags. */
+        out->records[i].sanitize =
+            ct3d->dc.regions[in->start_rid + i].flags & BIT(0);
+    }
+
+    stl_le_p(&extra_out->num_extents_supported, CXL_NUM_EXTENTS_SUPPORTED);
+    stl_le_p(&extra_out->num_extents_available, CXL_NUM_EXTENTS_SUPPORTED -
+             ct3d->dc.total_extent_count);
+    stl_le_p(&extra_out->num_tags_supported, CXL_NUM_TAGS_SUPPORTED);
+    stl_le_p(&extra_out->num_tags_available, CXL_NUM_TAGS_SUPPORTED);
+
+    *len_out = out_pl_len;
+    return CXL_MBOX_SUCCESS;
+}
+
 static const struct cxl_cmd cxl_cmd_set[256][256] = {
     [INFOSTAT][BACKGROUND_OPERATION_ABORT] = { "BACKGROUND_OPERATION_ABORT",
         cmd_infostat_bg_op_abort, 0, 0 },
@@ -3402,6 +3506,8 @@ static const struct cxl_cmd cxl_cmd_set_sw[256][256] = {
 static const struct cxl_cmd cxl_cmd_set_fm_dcd[256][256] = {
     [FMAPI_DCD_MGMT][GET_DCD_INFO] = { "GET_DCD_INFO",
         cmd_fm_get_dcd_info, 0, 0 },
+    [FMAPI_DCD_MGMT][GET_HOST_DC_REGION_CONFIG] = { "GET_HOST_DC_REGION_CONFIG",
+        cmd_fm_get_host_dc_region_config, 4, 0 },
 };
 
 /*